We do provide source code of these encrypted files for serious interested people who wanna help/contribute to FlexicaCMS.

This looks like a nice CMS - but, if you're not certain about releasing the source code, using the term "open source" is rather misleading.

You should sort out the licensing issues - there are people out there who know how to exploit software released under no clear licensing terms. You can change your mind later and release future versions of the CMS under different terms, but for your own sake, you should cover your backs and adopt an official license - whether it's an open source license or not.